What I normally do is to look at the examples. I copy and paste parts that I need. Look at the Analog examples and the Serial examples. You will have to scale your setting according to the value of the pot and the range that it represents in your circuit. The better way though is to use PWM (analogWrite(pin, value)) to a pin in stead of the pot. Look at the analogWrite examples in the libraries and use pin 13 on the UNO. The LED is coupled there.

You included the header file in your sketch instead of the code file. I included the header so that you can see how the chip was wired and to better understand the code. My code has many other files and was not done in the Arduino IDE but rather with a makefile.

This will compile. Please look at the comments for connection data. Also look at the spec sheet of the chip. There are only three signals in all.

NOTE: I did not initialize the pins in this sketch, you must do it in the setup section.

Code:

#include "Arduino.h"
 
 // POT
#define POT_SELECT 6  // connect the pot_cs of the chip to this pin
#define INC 1         // connect the clk of the chip to this pin
#define UD 5          // connect the direction pin of the chip to this pin
// Pot
#define UP 1
#define DOWN 0
#define SELECT 0
#define UN_SELECT 1
#define uint unsigned int

 void setPot (uint requestedSpeed)
  {
    char val[2];
    //calcPulses(val,config.motorSpeed, requestedSpeed);
    digitalWrite(INC,HIGH);
    digitalWrite(POT_SELECT,SELECT);
    digitalWrite(UD,val[1]);
    for(char i=1;i<val[0];i++)
    {
      digitalWrite(INC, HIGH);   // sets the pin on
      delayMicroseconds(5000);        // pauses for 50 microseconds     
      digitalWrite(INC, LOW);    // sets the pin off
      delayMicroseconds(5000);        // pauses for 50 microseconds         
    }
    digitalWrite(INC,HIGH);
    digitalWrite(POT_SELECT,HIGH);
    delay(20);
  }


  void resetPot (void)
  {
      pinMode(INC,OUTPUT);
      pinMode(POT_SELECT,OUTPUT);
      pinMode(UD,OUTPUT);
      digitalWrite(INC,HIGH);
      digitalWrite(POT_SELECT,SELECT);
      digitalWrite(UD,DOWN);
      for(char i=0;i<100;i++)
      {
        digitalWrite(INC, HIGH);   // sets the pin on
        delayMicroseconds(5000);     // pauses for 50 microseconds     
        digitalWrite(INC, LOW);    // sets the pin off
        delayMicroseconds(5000);     // pauses for 50 microseconds         
      }
      digitalWrite(INC,HIGH);
      digitalWrite(POT_SELECT,HIGH);
      delay(20);
   
  }

  void calcPulses (char val[],uint current, uint requested)
  {
    //char val[2];
    char RpmPp = 550; //config.maxSpeed / 100;
    if(current < requested)
    {
      val[0] = (requested - current)/RpmPp;
      val[1] = UP;
      //return (*val);
    }else
    if(current > requested)
    {
      val[0] = (current - requested)/RpmPp;
      val[1] = DOWN;
      //return (*val);
    }else
    {
      //return (0);
    }
   
   
  }
 
  void setup(void)
  {

  }
 
  void loop(void)
  {
   
  }
 

I have this in the header file

Code:

/**
 * @file x9cxx.h
 * @brief digital pot functions
 */
#ifndef x9cxx_H
#define x9cxx_H
// POT PINS
#define POT_SELECT 6
#define INC 1
#define UD 5
// Pot FUNCTIONS
#define UP 1
#define DOWN 0
#define SELECT 0
#define UNSELECT 1
  void setPot (uint requestedSpeed);
  void resetPot (void);
  void calcPulses (char val[],uint current, uint requested);


#endif // #ifndef x9cxx_H

And this bit is the code I used. Not all the variables are define in this piece of code but yoy should be able to see how it is done. Very easy really.

Code:

void setPot (uint requestedSpeed)
  {
    char val[2];
    calcPulses(val,config.motorSpeed, requestedSpeed);
    digitalWrite(INC,HIGH);
    digitalWrite(POT_SELECT,SELECT);
    digitalWrite(UD,val[1]);
    for(char i=1;i<val[0];i++)
    {
      digitalWrite(INC, HIGH);   // sets the pin on
      delayMicroseconds(5000);        // pauses for 50 microseconds     
      digitalWrite(INC, LOW);    // sets the pin off
      delayMicroseconds(5000);        // pauses for 50 microseconds         
    }
    digitalWrite(INC,HIGH);
    digitalWrite(POT_SELECT,HIGH);
    delay(20);
  }


  void resetPot (void)
  {
      pinMode(INC,OUTPUT);
      pinMode(POT_SELECT,OUTPUT);
      pinMode(UD,OUTPUT);
      digitalWrite(INC,HIGH);
      digitalWrite(POT_SELECT,SELECT);
      digitalWrite(UD,DOWN);
      for(char i=0;i<100;i++)
      {
        digitalWrite(INC, HIGH);   // sets the pin on
        delayMicroseconds(5000);     // pauses for 50 microseconds     
        digitalWrite(INC, LOW);    // sets the pin off
        delayMicroseconds(5000);     // pauses for 50 microseconds         
      }
      digitalWrite(INC,HIGH);
      digitalWrite(POT_SELECT,HIGH);
      delay(20);
   
  }


  void calcPulses (char val[],uint current, uint requested)
  {
    //char val[2];
    char RpmPp = config.maxSpeed / 100;
    if(current < requested)
    {
      val[0] = (requested - current)/RpmPp;
      val[1] = UP;
    }else
    if(current > requested)
    {
      val[0] = (current - requested)/RpmPp;
      val[1] = DOWN;
    }
  }

Hi all,
Does anybody know of a document that explains or lists the core built-in functions. Things like the stream.h and print etc. I would like to see what is available as I find myself writing stuff to later find it in the core files somewhere.

I found the replacement from one of the links that you provided earlier at this site:

http://www.cbxdragbike.com/arduino/new/

I dont recall where the eeprom.h file was located as I just pasted the new code when the file opened on the error. I think it was here though :

C:\arduino-1.0\hardware\tools\avr\avr\include\avr

It's working now. I replaced the eeprom.h file and now it is working. The sketch was a example for a TFT grapic display. Not my code.

Weird, I thought I fixed this a long time ago: http://code.google.com/p/arduino/issues/detail?id=381

Mellis,
It worked fine on Arduino0022. I just recently switched to Arduino1.0 as I was finishing up some projects and did not want to change midstream. The problem started with working code (from 0022) that was moved to Arduino1.0. It would seem that the Arduino1.0 core files are not all as up to date with your fixes.

Thanks guys, the new eeprom.h solves the problem.
The thing is - I did a search on the forum but picked up no responses for this problem. Maybe the criteria was wrong ;-)

Hi,
I am using Arduino1.0. All works fine when I select any 328 board but when I try to compile for the Mega2560, I get string of errors from the core that I cant find the reason for.

This is some of them

Code:

In file included from C:\arduino-1.0\hardware\arduino\cores\arduino\/Platform.h:7,
                 from C:\arduino-1.0\hardware\arduino\cores\arduino\CDC.cpp:19:
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h: In function 'void eeprom_read_block(void*, const void*, size_t)':
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:290: error: ISO C++ forbids incrementing a pointer of type 'void*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:290: error: ISO C++ forbids incrementing a pointer of type 'const void*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:290: error: invalid conversion from 'const void*' to 'const uint8_t*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:290: error:   initializing argument 1 of 'uint8_t eeprom_read_byte(const uint8_t*)'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h: In function 'void eeprom_write_block(const void*, void*, size_t)':
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:398: error: ISO C++ forbids incrementing a pointer of type 'void*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:398: error: ISO C++ forbids incrementing a pointer of type 'const void*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:398: error: invalid conversion from 'void*' to 'uint8_t*'
c:/arduino-1.0/hardware/tools/avr/lib/gcc/../../avr/include/avr/eeprom.h:398: error:   initializing argument 1 of 'void eeprom_write_byte(uint8_t*, uint8_t)'

Correct.

Yeah, I discovered the Arduino tag. It seems to be working ok now, thanks. Now I need to call Avrdude from my C# application

Hi all
I am trying to get Avrdude to talk to the boatloader on the Uno with these lines in my makefile

DEVICE     = atmega328p
PROGRAMMER = -c stk500 -P com38
AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE) -B 10 -F

I get a continues timeout. What am I doing wrong or is this not possible?

Erni,
It wasn't a problem before. I used Com31 for the Arduino from the start. It is only after the Uno R3 installation that things are buggered. I strongly suspect the windows driver.

Nick,
I almost feel that you think I am telling lies.



Here I have the Deumilanove on Com31 and the Uno on Com38. The ISP is on Com35 and Com37.

Sorry I can't capture the menu option in Arduino IDE but I promise they are all there.

Louis
They show in the list but I get the

avrdude: stk500_getsync(): not in sync: resp=0x00

error. When I say "does not see" I mean does not communicate. This happens for the programmer as well as the boatloader.

I have been able to get the Uno R3 to program via the bootloader that it comes with but only under Arduino1.0. Arduino-1.0 also does not see any of the AvrIsp programmers

Arduino-0022 does not see anything at the moment.